Flame retarding plastic materials

Abstract

The specification discloses flame retarding plastic materials which contain, as the flame retarding agent, a phosphinic, diphosphinic or tri-phosphinic acid derived from 2-alkyl-2,5-dioxo-1,2-oxaphospholane and an organic monoamine or diamine or triamine, respectively.

What is claimed is: 
     
       1. A polymer molding composition containing a flameproofing agent, wherein the flameproofing agent is a phosphinic acid or a salt thereof corresponding to the formulae ##EQU6## wherein R is an alkyl radical having from 1 to 8 carbon atoms, R 1  is hydrogen or an open-chain or cyclic alkyl radical having from 1 to 18 carbon atoms, which optionally contains halogen atoms, or an aryl or aralkyl radical optionally being substituted by halogen atoms,   R 2  is an open-chain or cyclic alkyl radical having from 1 to 18 carbon atoms, which optionally contains halogen atoms, or an aryl or aralkyl radical optionally being substituted by halogen atoms,   R 3  is hydrogen or an open-chain or cyclic alkyl radical having from 1 to 18 carbon atoms, which optionally contains halogen atoms,   R 4  is an open-chain alkylene radical having from 1 to 18 carbon atoms or a cyclic alkylene, arylene, arylalkylene, arylene-alkylene or arene-bisalkylene radical having from 1 to 6 carbon atoms in the alkylene radical,   R 5 , r 6 , r 9  are as defined for R 3 , and   R 7  and R 8  are as defined for R 4  ; the radicals R 3 , R 5 , R 6  and R 9  on the one hand, and R 4 , R 7  and R 8  on the other hand being identical or different.     
     
     
       2. The polymer molding composition as claimed in claim 1, wherein the phosphinic acid is contained in an amount of from 1.5 to 40, preferably from 2 to 30, and especially from 2 to 25 weight %, calculated on the weight of the polymer. 
     
     
       3. The polymer molding composition as claimed in claim 1, wherein the phosphinic acid of formula I, in which R is a methyl radical, R 1  is hydrogen, and R 2  is a 2,4,6-tribromophenyl radical, is contained as flameproofing agent. 
     
     
       4. ##EQU7##